dtrace discuss - Mar 2007 - Output redirection problem of DTrace

Hi,

 

I am using prustat to monitor the DISK, CPU, MEM and NET usage by some
specific users.

I am using the following command for the purpose.

 

prustat 5 | /usr/xpg4/bin/grep -E ''COMM|java|bash''

 

When I execute the above command from command line I am getting the
output as shown below.

 

 root at MFIN-SOL01:scripts1 [561] prustat 5 | /usr/xpg4/bin/grep -E
''COMM|java|bash''

  PID   %CPU   %Mem  %Disk   %Net  COMM

 1740   0.06   1.55   0.00   0.00  java

 2160   0.53   1.01   0.00   0.00  java

16227   0.03   0.05   0.00   0.00  bash

17297   0.00   0.06   0.00   0.00  bash

17267   0.00   0.05   0.00   0.00  bash

16028   0.00   0.05   0.00   0.00  bash

  PID   %CPU   %Mem  %Disk   %Net  COMM

 1740   0.07   1.55   0.00   0.00  java

 2160   0.40   1.01   0.00   0.00  java

16227   0.02   0.05   0.00   0.00  bash

17297   0.00   0.06   0.00   0.00  bash

17267   0.00   0.05   0.00   0.00  bash

16028   0.00   0.05   0.00   0.00  bash

 

Till this point it is fine.

 

But I am not able to redirect the output to some file.

 

prustat 5 | /usr/xpg4/bin/grep -E ''COMM|java|bash'' >
abc.out

 

This command creates a file abc.out but no data will be recorded. It
will be of size "0"
even after few minutes.

 

Kindly suggest/help me to understand and solve the problem?

 

Thanks in advance for any help.

 

Regards,

Ramesh.


 


Ramesh Polepalli









mFormation Technologies Inc.
Direct Line: +91 80 6620 5939
Switchboard: +91 80 6620 5900

http://www.mformation.com
 









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Looks like egrep buffers when its stdout is not a terminal; and
by more than the usual amount.  The same thing happens if you
pipe the output of egrep to cat; and also if you use sed or awk
instead of egrep.

If you have such programs, you might be able to make it think
it''s talking to a terminal and thus not buffer by running it under
"expect", "screen", or the like.  I don''t know how
to use those
off the top of my head, so I can''t help you do that.
 
 
This message posted from opensolaris.org

G''Day Ramesh,

On Fri, Mar 23, 2007 at 12:26:11PM +0530, Ramesh Polepalli
wrote:
> Hi,
> 
> 
> 
> I am using prustat to monitor the DISK, CPU, MEM and NET usage by some
> specific users.
> 
> I am using the following command for the purpose.
> 
> 
> 
> prustat 5 | /usr/xpg4/bin/grep -E ''COMM|java|bash''
If you are interested in usage by particular processes or users, it
would be best to write your own custom DTrace script - rather than
grepping the output from one.

Brendan

-- 
Brendan
[CA, USA]